Barclays ATP World Tour Finals - Day Five [Getty Images]

LONDON, ENGLAND - NOVEMBER 13: (EDITORS NOTE: This image was created using an in camera multiple exposure with a star filter on the lens) David Ferrer of Spain plays a forehand in the round robin singles match against Kei Nishikori of Japan on day five of the Barclays ATP World Tour Finals at O2 Arena on November 13, 2014 in London, England. (Photo by Justin Setterfield/Getty Images)

Getty Images Sport Justin Setterfield